Organic Chemistry

With Chemical Synthetic Biology they are 6 Double-Bases = 12 DNA Bases possible (Image)... Why are they not 8 Double-Bases = 16 DNA Bases possible???... Image: (111) - (000) Why cannot the middle Oxygen atom make a Hydrogen Bond???... Oxygen: 2e- = Lone none-bonding electron pair (2e-) 2e- = Hydrogen Bond (2e-) 2e- = simple Bond (1e-) 2e- = simple Bond (1e-)

Hello dear friends!I have a question about a reaction route in my thesis. I am synthesized thiosemicarbazide then in alkaline/acidic medium is synthesized from thiosemicarbazide to triazoles/thiadiazoles.However alkyl isotiyosyanate as methyl/ethyl/cyclohexyl can be thiosemicarbazide, 2-pieridino ethyl and 2-(4-morpholino) ethyl isothiosyanate isn't thiosemicarbazide and is directly transforming triazole. But I don't want to direct this cyclization. Because thiazdiazoles obtain from that thiosemicarbazides.I want to get morpholino and piperidino ethyl thiadiazole. May are you doing advice this difficult problem. thanks everyone !

hello, I wanted to know if i labeled the possible products correctly [i.e. minor vs. major]. reasoning: Although there is less steric hinderance for the Hydride ion through front (because of sterics of the CH(CH3)2 group on the dash) that won't be deciding factor for the amount of major product formed. The back side attack will form the major product because the larger OH and CH(CH3)2 groups are anti to each other. Is this correct? thank you in advance

Hello The problem: Suggest reagents for the following transformations. Remember that protic solvents are present to protonate the alkoxide ions that are formed in teh nucleophilic attack on the oxirane. I don't understand how the mechanism works. The final product is attacked at the least hindered carbon indicating it is in basic conditions, but the reagent given is an electrophile. I don't understand how it would attack the starting material. Thank you in advance.

This may be a bit more rudimentary than other topics, but I figured I'd ask anyways. I own my own business as a caterer, and some of the various things we have to pay attention to is temperatures with food transport. If it's cold, I need to maintain cold, often times for hours prior to service. If it's hot, the same thing goes. My question is; does freezing ice, or other items such as freezer gel packs and so on, to -20F vs 0F make a substantial difference, or is it merely a mental illusion, and the difference is very little? We prepare all of our food out of a Commercial Kitchen that has a commercial freezer set to 0F, but I also have a deep freezer at home that…

I hope I'm posting the the correct spot. I have a question I'm not even sure how to ask properly. I am experimenting with electrocoagulation, electro flocculation, and electroflotation in the pretreatment of wastewater. I need to achieve 20mA/cm2 in my electrolysis chamber. I dont really understand what this means. I have a 1500w bench style DC power supply. I connect it to Al and Fe electrodes. Is the formula referring to the surface area of the electrodes or the conductivity of the solution? I'm assuming this is referring to the surface area of the electrodes. If that is indeed the case how do I assure I'm achieving the desired current per surface area? Do I just …

Hello, Im confused are these diasteriomers or enantiomers? A peer said they were enantiomers, but i only can see the possible products as diasteriomers of each other.

acetic anhydride synthesis I was disided to synthesis acetic anhydride by ketene method

Hi all, i am prepping for the med school exam (MCAT) and I came across this molecule in my practice questions. I got the Q wrong and the explanations called this a Quaternary amine. I recognize that the nitrogen atom is Quaternary, but since only 3 of the 4 groups attached to the N are carbons (the last is sulfur), can I still count this as a Quaternary amine? Is tertiary amine with a Quaternary N more accurate? Thanks much.

so does 2,5-dimethylhex-4-yn reacted with HBr have stereoisomers or not? I thought it would have E and Z because there is a carbo cation and HBr obeys Markovnikov and its can either go the syn and anti routes. But someone i compared with said that wasn't the case here because there is no steric hinderance so there is no stereoselectivity. I can't come to terms with this pls help

Hi. I can't figure out these two questions (3 and 5). Can someone please solve them? I have every other question done.

At first, I (hastily) thought (4) was the redox reaction since H2SO4 is an oxidizing agent, however it turned out, according to the answer key, that (1) is the answer. I don't understand how and why only (1) is an oxidizing agent. For example, in (2) the oxidation number of the 2nd carbon increases and the 3rd carbon decreases. And also in (3) Should I ignore the carbon when considering redox reactions on organic compounds? Or is my method wrong in any way?

We know that Grignard reagent is strongly basic. It is stronger than NaOH. We also know that sodium hydroxide is just enough to abstract a proton from active methyl group of acetaldehyde to carry out aldol reaction. Now my point is, if we use Grignard reagent, acetaldehyde should undergo aldol reaction instead of Grignard reaction. Any comments?

When obtaining an IR spectrum, a secondary amine should exhibit only one N-H stretch, however, when a student ran his sample, two N-H stretches appeared in the spectrum. What could account for this?

A secondary amine should only exhibit only one N-H stretch. However, 2 N-H stretches appeared in the spectrum. What could account for this?

Hello friends, I feel pretty confident about my answers. I can't check the answers on my school's canvas site because the link doesn't work! Could someone check and see if they are correct? I want to make sure I have this topic down packed, so that I can move on to a different subject. Any help is appreciated! Thank you in advance

Hello nice people! As a teenager I once obtained a polymer... But which one? I had dry NaOH in a test tube as d=1mm balls, plus some Aluminium balls, both coming directly from a household product sold to clean toilet flows. I poured Cl3C-CH3 (1,1,1-trichloroethane sold as thinner for tipp-ex) on them. All at room pressure and temperature, and under the best teenager practices of unknown purity, uncontrolled proportions and approximate cleanliness. An emulsion formed and buoyed to the surface where it formed a solid stopper, about 1/3 the volume of trichloroethane (maybe limited by the available NaOH). I had to break the test tube to get the stopper. Whe…

When extracting diphenhydramine from hexane and calculating the concentration of diphenhydramine using the Beer-Lambert law, the ratios of NH3/NH4+ don't match the expected ratios based on the Henderson-Hasselbalch equation. Why?

Please, could someone check if I did this correctly? It's worth 9 points and theres a large box so I think I'm missing something. Thanks in advance!

Hello, I am the first time confronted with a 13C-NMR, in which a coupling between the 13C and 31-P cores takes place. I am very unsure about the signal assignment in the molecule present in the appendix. I have assigned the signals so that the coupling becomes smaller at a greater distance from the 31P core. My "Assignment": 13C NMR (101 MHz, CDCl3): δ (ppm) = 232.64 (d, J = 25.2 Hz, C (14.15)), 138.32 (d, J = 40.3 Hz, C (8)), 133.07 (i.e. , J = 9.9Hz, C (9.13)), 129.59 (C (10.12)), 128.23 (d, J = 8.9Hz, 3.4)), 87.57 (C (2.5)), 80.98 (C (1)), -3.10 (C (6.7)). However, I 'm very unsure about the assignment of the 13C signals of the cyclopentadienyl ring…

Hi, I'd like to know how to synthesize piperonal using piperine as my precursor, could anyone point me in the correct direction to do this? Thanks!

Hello! I don't understand why it is (S) rather than (R). The circled numbers are the rankings of priority according to Cahn-Ingold-Prelog Rules. I thought it would be clockwise. The molecule seems to be oriented correctly with the H in the back because of its low priority. My answer key says it should be (S)-1-chloro-3,4-dimethylpentane. Sorry for the sideways pics. I couldn't find a way to rotate them. Thanks in advance!

hi please some one tell me what is diffrent between isomer and epimers ? i should complete this answer thanks

Hello, I have to find which one has the shortest length to the longest. I think it's O, N, M. >hybridization is the same >atom size is the same >electronegativity is the same >charge is the same ------------ O has about 7 resonance structures, N has about 2 resonance structures, M has about 7.n I'm not sure how much induction is a factor if at all because they are too far away. The smaller pKa has the most stable conjugate base. I dont understand what the OCH3 and OCCH3 do to the groups. any help is appreciated update: turns out we haven't covered this in class and it won't be on exam one lol, but I …